Hitbox.io seems to be an online multiplayer game that has undergone updates to include new features. The game appears to have an "endless team fight mode" and has introduced team-based objectives to the editor. The objective in multiplayer arena battle games is typically to defeat or outlast your opponents. This could involve eliminating them, scoring points, or achieving other specific goals.
Endless Team Fight Mode:
Team Spawns in the Editor:
Winning by Getting an Object to a Goal:
Joining Endless Team Fight Mode: